Issues with migrating from OSS 4.0.4 to NW 4.5.7

Can I get some assistance on the issue highlighted below. I hope this is not a duplication but I have searched the forums and I have not found any article addressing something similar.

We have been using Zimbra OSS for almost a year now and we like. Recently, we decided to move to the Network Edition and we have been having problems.

Our problem is that users cannot log into test machine before moving it to production. Below are the steps we took to migrate. The production system is running on opensuse 10.2 and the zimbra OSS version is 4.0.4GA. We are trying to migrate this on a server with 8x1.8Ghz Processors and 9Gigs of RAM using Zimbra Network Edition 4.5.7GA

1. Installed the OS and installed all required packages
2. untar a backup copy into /opt/zimbra
3. Test if users can connect ( Using one user really) to the new server --- Passes
4. Check if the user list exist: zmprov -l gaa --- Got the correct number of users as the live server
5. Run install.sh --- All goes well as per questions asked
6. After completion of the upgrade, reboot the server just incase.
7. Tried logging as the same user we tested with --- Failer
8. Check if users exist as in step 4 --- Failer ( Only the spam and ham accounts are shown)
9. Check for error in /tmp/migrate-MailboxGroup.sql -- nothing
10. Check for error in /tmp/zmpsetup.log -- Nothing
11. Check for error in /tmp/logprocess.out --nothing

I have tried digging in the forums but I could not find anything. One of the error I had on my previous test was related to Virtual Memory and that was sorted once I ran zmlocalconfig and set java heap memory to 5. This seems to have gone away.

The question I have is what have we done wrong. In between there is a mention problem regarding the proc table of which I will be trying next to see if it would get me anywhere.